This paper proposes a circuit control method achieving the flat-top steep-edge response of photodetectors. The response
is realized using three wavelength selective photodetectors and the circuit which consists of amplifiers, comparators and
a AND gate. Two groups of experiments were carried out. In group 1, 0.5dB, 3dB, 20dB bandwidths are 2.76nm,
3.29nm, 4.58nm from 1546nm to 1549.3nm. In group 2, 0.5dB, 3dB, 20dB bandwidths are 3.19nm, 2.89nm, 3.06nm
from 1554.8nm to 1557.6nm. The results of experiments show that the desirable flat-top steep-edge response can be
gained and the response linewidth is adjustable by selecting different photodetectors, so that the requirement of the
WDM system and the network can be met. The method is easy to realize with low cost and has wide application in
optical measurements and optical processing etc.
A novel approach, using a PNA(network analyzer) instead of Spectrum Analyzer in optical heterodyne measurement
system, to characterize the frequency response performance of photodetectors is proposed. This scheme synthesize the
advantages of both the optical heterodyne technique and accurate calibration technique of PNA. In this paper, two tunable
narrow linewidth lasers are used to reduce the errors caused by the variations in the linewidth of the beat signal, and the
optical power is accurately monitored and controlled to minimize the noise due to laser output power fluctuates. We
analyze the influence of variations linewidth, and associative simulation on this influence is been done. And an error
eliminate model is presented to remove the influence of variations linewidth. SOLT calibration technique is used to
accurately calibrate the power receiver of PNA. In addition, when configured with an 80 GHz frequency mixer in this
measurement system, we can achieve the frequency response measurement of a 80 GHz photodetector since we are using a
40 GHz PNA.
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